Since the P2 ships without a gearbox, I’ve got to make one. I did some basic math to work out impeller speeds and motor speeds needed, then decided a 1:2 gearbox on the P2 would be suitable, then a 1:1.8 to 1:2.5 from crank would do the rest if needed. I ordered a T5 36 … Continue reading P2 Supercharger – The Gearbox – Part 1